Frederick e



(Nb Model.) I FFE. SOHMITT.

ROLLER FRAME ADJUSTMENT FOR SANDERS.

Patented Dec. 28,1897.

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UNITED STATES PATENT Curios.

FREDERICK E. SCHMITT, OF GREEN BAY, WISCONSIN, ASSIGNOR TO THE MILWAUKEESANDER MANUFACTURING COMPANY, OF SAME PLACE.

ROLLER-FRAME ADJUSTMENT FOR SANDERS.

SPECIFICATION forming part of Letters Patent N0. 596,232, dated December28, 1897.

Application filed July 6,1897. Serial No. 643,550; (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK E. SOHMITT, of Green Bay, in the county ofBrown and State of Wisconsin,have invented certain new and usefulImprovements in Roller-Frame Adjustments for Sanders; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itpertains to make and use the same, reference being had to theaccompanying drawings, and

to the letters of reference marked thereon,

. pointed out in the claims.

In the accompanying drawings like letters designate the same parts inboth figures.

Figure 1 is a vertical longitudinal section of a portion of asanding-machine to which my improvement is applied, the plane of thesection being indicated by the line 1 1, Fig. 2 and Fig. 2 is ahorizontal section in the plane indicated by the line 2 2, Fig. 1.

A designates a portion of the main frame, 13 the bed, C one of thepolishing drums or cylinders, D D lower feed-rollers, E the upperroller-frame, F F upper feed-rollers, and G an upper resser-rolleropposite the polishing-cylinder, all of the usual or any suit ableconstruction and arrangement in or for this class of machines.

The roller-frame E is supported at the corners by vertical screws H,which are threaded therein and have bearings at their upper and lowerends in corner-posts I, mounted on the main frame or bed of the machine.The. several adjusting screws carrying the rollerframe are connected inthe usual way by shafts J and interrneshing bevel-gears h and j, aspartially shown in Fig. 1, so as to simultaneously raise and lower saidframe equally at its four corners.

It is well known that in machines of this kind the polishingcylindersmust be constructed and adjusted with great accuracy, and the bearingsof the cylinders and feedrollers must also be accurately adjusted andfirmly supported without play in order to produce satisfactory work. Inmachines having the upper feed-rollers carried by a frame which is adjustably supported by vertical screws threaded therein, as shown in the.

drawings, the backlash or play of the screws in the roller-frame allowsit to tip more or less forward or backward. This movement of the frame,occurring particularly when the material enters and leaves the machine,causes the polishing-cylinders to gouge into the work and thus producewavy and imperfect surfaces. To cure this defect is the purpose of myimprovement, which consists of a device for preventing the backlash orfor taking up the play of the adj listing-screws in the'rollerframe.

I Upon each of the screws H, below the rollerframe or that part of theframe with which it engages, is a nut or threaded sleeve K, as shown inFig. 1. Each of these sleeves is formed at its upper end with acup-shaped spring-seat k and at its lower end with a notched rim orflange k. A heavy spiral spring L is interposed between the frame andeach nut or sleeve, as shown in Fig. 1. These springs are made ofsufficient strength to sustain the weight of the roller-frame and themechanism which it carries.

M are dogs or detents forholding the sleeves K,when properly adj usted,from turning upon the screws H. They may be attached to theroller-frame, as shown in the drawings, so as to be readily disengagedfrom and engaged with any of the notches in the flanges k of the sleevesK. As shown in the drawings, they are longitudinally slotted and securedby bolts m in recesses formed in the under side of the roller-frame. Byloosening the bolts m the detents may be withdrawn from engagement withthe notched flanges for the purpose of adjusting the sleeves Kto varythe tension of the springs L,as desired. When these adjustments havebeen made, the detents M are thrust forward into the adjacent notches inflanges k and secured in place by the screws m.

In practice the sleeves K are turned upwardly 011 the screws II untilthe springs take up all play between the upper sides of the threads inthe frame and the under sides of the threads on the screws and firmlysupport said frame in that position. By this means the frame isprevented from tilting up at either end and down at the opposite endwhen a piece of material enters or leaves the ma- 1 chine, and evenperfect surfaces are insured if the machine is in other respectsproperly constructed and adjusted.

I claim 1. In a sanding-machine the combination with the roller-frameand vertical ad justin gserews engaging the same, of sleeves threaded onsaid screws and springs interposed between said sleeves and frame,substantially as and for the purposes set forth.

2. In a sanding-machine the combination with the roller-frame andvertical adjustingscrews engaging threaded holes in said frame andsupported in bearings in the main frame, of sleeves threaded on saidscrews, dogs or catches for holding said sleeves from turning on saidscrews and spiral springs interposed between said sleeves and frame,substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

FREDERICK E. SC I'IMITT.

\Vitnesses:

CHAS. L. Goss, M. L. EMERIY.

